You say after pulling the trigger a dozen times or so it fires....this shows the firing pin is catching the sear bar, so the problem is most likely in the sideplate/trigger lever assembly, but checx the simplest things first. Make sure the spring loaded pin at the end of the sear bar is moving in and out freely. Make sure the trigger lever pin is secure in the sideplate. If so....with the gun cocked and unloaded, pull the trigger while watching and feeling the sideplate for motion...if it pushes away from the gun, there is too much play between the tang on the sideplate and the takedown lever. This can be remedied by gently bending the tang to provide a resistance fit when the takedown lever is closed. If this isn't the problem, it could be that the "L" shape of the trigger lever isnt at an acute enough angle to provide enough motion when the trigger is pulled to fully press on the sear bar pin. This is a touchier fix...it's hard metal and can snap if you attempt to bend it. I have had success doing it though by heating in a vise it to a dull red with a propane torch and tapping gently with a brass mallet to increase the angle...doesn't take much.
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